How lore-wise would it be to assume that many crew members aboard the Sword of Orion were corrupted by mere presence and vision of the Chaos Space Marines within several hours and became some primitive chaos-tainted mindless puppets? I mean ordinary technical personnel, wounded guardsmen or even some nearly dead? The mere presence of traitor marines can inflict mind-shaking terror into ordinary humans, especially Khornates and those who fought them or was killed (wounded) by their weapons experienced this terror magnified tenfold. Assuming also that Khornates are literally boiling with tainted warp power circulating in their flesh and armour, they can spread foul chaos energies in their wake even unconsciously, some tiny yet strong enough for usual mortals warp daemons capturing minds and bodies of their preys.

I need this clarification to make one battle scene involving dozens of corrupted zombie-like imperials

I could see that working, the way i see it happening would be high levels of aggression with no filter. Minor issues that just result in fist fights. Trying to think of a good example.... But i think you get the point.

Indeed, some imperial vessels (especially those of Mechanicus) are literally huge space cities with uncounted thousands of people swarming inside, it's often unknown even to ships' commanding echelons what's going on on the lower decks, in ships' bellies - pretty like underhives on hive worlds.....